【摘要】 在研究结构的随机地震反应时,要用大量的符合场地条件的地震波作为输入。但强震历史记录却不是每个地区都有的,因此根据现有地震波建立符合场地条件的地震动模型具有重要意义。地震动具有很强的随机性和非平稳性,本文使用时变ARMA模型来建立地震动模型。为了使结果更具有普遍性,选用ElCentro波、Northridge波作为原波,分别利用作者编制的WINSIM程序建立了时变ARMA模型,并通过所建模型生成的模拟波与原波的比较,对模型的有效性进行了检验。更多还原

【Abstract】 Study on the stochastic seismic response of the structure, more earthquake records fit for the selected site to input to structure model are needed. But in the given site it always hasn’t the strong earthquake records,thus it’s very significant to generate satisfactory reproduction of the observed acceleration. In this paper the time-vary ARMA model is used for simulating the earthquake, since the earthquake is the nonstationary stochastic process. For the result has universality, the suggested procedure in producing synthetic accelerogram corresponding to the two records of El centro and Northridge are applied. In this paper, the time-vary ARMA model is created through the WINSIM programmed by authors. Then the simulated and ‘target’ ground motions are compared, and the model is checked whether the estimated earthquake model is sufficient for representation of the ground motion variability associated with a given real earthquake process.更多还原